babeltrace master: trace-compass is unable to open trace with index

["MOESSBAUER, Felix via lttng-dev" <lttng-dev@lists.lttng.org>]

Hi,

the babeltrace version from the master branch (65fb4669f) is able to
create LTTng index files. However, these index files seem to be
incompatible with trace-compass.

On loading such a trace, trace-compass (incubator version, 0.18.0-
20260711-0558, or release 12.0.0) issues the following error message:

> Error initializing trace.
> org.eclipse.tracecompass.tmf.core.exceptions.TmfTraceException:
> Failed to allocate mapped byte buffer at 36 of size 416 on a
> file of size 176

I double checked the traces with babeltrace and
https://github.com/eepp/jacquesctf , which are both able to properly
read the traces.

For reproducing, run the
tests/plugins/sink.ctf.fs/test_create_lttng_index.py test and open any
of the generated CTF files in trace-compass. I explicitly tested and
reproduced it with "with-packets-ctf-2" and "no-packets-ctf-2".

The traces itself are valid, which can be proved by removing the index
file and successfully re-opening them in trace-compass.

PS: I'm pretty sure this is a trace-compass bug, but as I'm not a
member of the tracecompass-dev ML, I report it here. Feel free to
forward.

Best regards,
Felix Moessbauer

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